Treat yourself after leg day. Steak tips with roasted sweet potato replenish glycogen and deliver the iron and protein your muscles are screaming for.
Preheat your oven to 425°F. Scrub and dice the sweet potatoes into 1-inch cubes, keeping the skin on for extra fiber.
Toss sweet potato cubes and sliced red onion with 1.5 tbsp olive oil, half of the sea salt, paprika, and half of the black pepper. Spread out on a baking sheet in a single layer.
Roast sweet potatoes and onion for 25–30 minutes, flipping once halfway, until crisp-edged and deep golden brown.
While vegetables roast, pat steak tips dry and season evenly with remaining salt, pepper, and garlic powder. Heat a large skillet over medium-high and add 1.5 tbsp olive oil until shimmering.
Sear steak tips for about 3–4 minutes per side for medium-rare, turning only once; adjust time for your preferred doneness. Rest steaks 3 minutes, then slice against the grain.
Wilt baby spinach in the hot (but off-heat) pan for 1 minute, stirring gently.
To plate, layer roasted sweet potatoes and onions, top with wilted spinach, and finish with sliced steak tips. Serve immediately.